How much is 1 gram to a dollar?

Excuse me, I'm curious about a conversion that's been puzzling me. Could you please clarify for me how much one gram of a particular substance, let's say gold for simplicity's sake, is equivalent to in US dollars? I understand that the value fluctuates based on market conditions, but I'm looking for a general idea or an average figure to get a sense of the relationship between weight and monetary value. Thank you in advance for your insight.